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Merge branch 'vhost-net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mst...
[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_state.c
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1/*
2 * xfrm_state.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific functions
11 * Derek Atkins <derek@ihtfp.com>
12 * Add UDP Encapsulation
13 *
14 */
15
16#include <linux/workqueue.h>
17#include <net/xfrm.h>
18#include <linux/pfkeyv2.h>
19#include <linux/ipsec.h>
20#include <linux/module.h>
21#include <linux/cache.h>
22#include <linux/audit.h>
23#include <asm/uaccess.h>
24#include <linux/ktime.h>
25#include <linux/slab.h>
26#include <linux/interrupt.h>
27#include <linux/kernel.h>
28
29#include "xfrm_hash.h"
30
31/* Each xfrm_state may be linked to two tables:
32
33 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
34 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
35 destination/tunnel endpoint. (output)
36 */
37
38static DEFINE_SPINLOCK(xfrm_state_lock);
39
40static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
41
42static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
43static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
44
45static inline unsigned int xfrm_dst_hash(struct net *net,
46 const xfrm_address_t *daddr,
47 const xfrm_address_t *saddr,
48 u32 reqid,
49 unsigned short family)
50{
51 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
52}
53
54static inline unsigned int xfrm_src_hash(struct net *net,
55 const xfrm_address_t *daddr,
56 const xfrm_address_t *saddr,
57 unsigned short family)
58{
59 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
60}
61
62static inline unsigned int
63xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
64 __be32 spi, u8 proto, unsigned short family)
65{
66 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
67}
68
69static void xfrm_hash_transfer(struct hlist_head *list,
70 struct hlist_head *ndsttable,
71 struct hlist_head *nsrctable,
72 struct hlist_head *nspitable,
73 unsigned int nhashmask)
74{
75 struct hlist_node *entry, *tmp;
76 struct xfrm_state *x;
77
78 hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
79 unsigned int h;
80
81 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
82 x->props.reqid, x->props.family,
83 nhashmask);
84 hlist_add_head(&x->bydst, ndsttable+h);
85
86 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
87 x->props.family,
88 nhashmask);
89 hlist_add_head(&x->bysrc, nsrctable+h);
90
91 if (x->id.spi) {
92 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
93 x->id.proto, x->props.family,
94 nhashmask);
95 hlist_add_head(&x->byspi, nspitable+h);
96 }
97 }
98}
99
100static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
101{
102 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
103}
104
105static DEFINE_MUTEX(hash_resize_mutex);
106
107static void xfrm_hash_resize(struct work_struct *work)
108{
109 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
110 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
111 unsigned long nsize, osize;
112 unsigned int nhashmask, ohashmask;
113 int i;
114
115 mutex_lock(&hash_resize_mutex);
116
117 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
118 ndst = xfrm_hash_alloc(nsize);
119 if (!ndst)
120 goto out_unlock;
121 nsrc = xfrm_hash_alloc(nsize);
122 if (!nsrc) {
123 xfrm_hash_free(ndst, nsize);
124 goto out_unlock;
125 }
126 nspi = xfrm_hash_alloc(nsize);
127 if (!nspi) {
128 xfrm_hash_free(ndst, nsize);
129 xfrm_hash_free(nsrc, nsize);
130 goto out_unlock;
131 }
132
133 spin_lock_bh(&xfrm_state_lock);
134
135 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
136 for (i = net->xfrm.state_hmask; i >= 0; i--)
137 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
138 nhashmask);
139
140 odst = net->xfrm.state_bydst;
141 osrc = net->xfrm.state_bysrc;
142 ospi = net->xfrm.state_byspi;
143 ohashmask = net->xfrm.state_hmask;
144
145 net->xfrm.state_bydst = ndst;
146 net->xfrm.state_bysrc = nsrc;
147 net->xfrm.state_byspi = nspi;
148 net->xfrm.state_hmask = nhashmask;
149
150 spin_unlock_bh(&xfrm_state_lock);
151
152 osize = (ohashmask + 1) * sizeof(struct hlist_head);
153 xfrm_hash_free(odst, osize);
154 xfrm_hash_free(osrc, osize);
155 xfrm_hash_free(ospi, osize);
156
157out_unlock:
158 mutex_unlock(&hash_resize_mutex);
159}
160
161static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
162static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
163
164static DEFINE_SPINLOCK(xfrm_state_gc_lock);
165
166int __xfrm_state_delete(struct xfrm_state *x);
167
168int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
169void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
170
171static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
172{
173 struct xfrm_state_afinfo *afinfo;
174 if (unlikely(family >= NPROTO))
175 return NULL;
176 write_lock_bh(&xfrm_state_afinfo_lock);
177 afinfo = xfrm_state_afinfo[family];
178 if (unlikely(!afinfo))
179 write_unlock_bh(&xfrm_state_afinfo_lock);
180 return afinfo;
181}
182
183static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
184 __releases(xfrm_state_afinfo_lock)
185{
186 write_unlock_bh(&xfrm_state_afinfo_lock);
187}
188
189int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
190{
191 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
192 const struct xfrm_type **typemap;
193 int err = 0;
194
195 if (unlikely(afinfo == NULL))
196 return -EAFNOSUPPORT;
197 typemap = afinfo->type_map;
198
199 if (likely(typemap[type->proto] == NULL))
200 typemap[type->proto] = type;
201 else
202 err = -EEXIST;
203 xfrm_state_unlock_afinfo(afinfo);
204 return err;
205}
206EXPORT_SYMBOL(xfrm_register_type);
207
208int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
209{
210 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
211 const struct xfrm_type **typemap;
212 int err = 0;
213
214 if (unlikely(afinfo == NULL))
215 return -EAFNOSUPPORT;
216 typemap = afinfo->type_map;
217
218 if (unlikely(typemap[type->proto] != type))
219 err = -ENOENT;
220 else
221 typemap[type->proto] = NULL;
222 xfrm_state_unlock_afinfo(afinfo);
223 return err;
224}
225EXPORT_SYMBOL(xfrm_unregister_type);
226
227static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
228{
229 struct xfrm_state_afinfo *afinfo;
230 const struct xfrm_type **typemap;
231 const struct xfrm_type *type;
232 int modload_attempted = 0;
233
234retry:
235 afinfo = xfrm_state_get_afinfo(family);
236 if (unlikely(afinfo == NULL))
237 return NULL;
238 typemap = afinfo->type_map;
239
240 type = typemap[proto];
241 if (unlikely(type && !try_module_get(type->owner)))
242 type = NULL;
243 if (!type && !modload_attempted) {
244 xfrm_state_put_afinfo(afinfo);
245 request_module("xfrm-type-%d-%d", family, proto);
246 modload_attempted = 1;
247 goto retry;
248 }
249
250 xfrm_state_put_afinfo(afinfo);
251 return type;
252}
253
254static void xfrm_put_type(const struct xfrm_type *type)
255{
256 module_put(type->owner);
257}
258
259int xfrm_register_mode(struct xfrm_mode *mode, int family)
260{
261 struct xfrm_state_afinfo *afinfo;
262 struct xfrm_mode **modemap;
263 int err;
264
265 if (unlikely(mode->encap >= XFRM_MODE_MAX))
266 return -EINVAL;
267
268 afinfo = xfrm_state_lock_afinfo(family);
269 if (unlikely(afinfo == NULL))
270 return -EAFNOSUPPORT;
271
272 err = -EEXIST;
273 modemap = afinfo->mode_map;
274 if (modemap[mode->encap])
275 goto out;
276
277 err = -ENOENT;
278 if (!try_module_get(afinfo->owner))
279 goto out;
280
281 mode->afinfo = afinfo;
282 modemap[mode->encap] = mode;
283 err = 0;
284
285out:
286 xfrm_state_unlock_afinfo(afinfo);
287 return err;
288}
289EXPORT_SYMBOL(xfrm_register_mode);
290
291int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
292{
293 struct xfrm_state_afinfo *afinfo;
294 struct xfrm_mode **modemap;
295 int err;
296
297 if (unlikely(mode->encap >= XFRM_MODE_MAX))
298 return -EINVAL;
299
300 afinfo = xfrm_state_lock_afinfo(family);
301 if (unlikely(afinfo == NULL))
302 return -EAFNOSUPPORT;
303
304 err = -ENOENT;
305 modemap = afinfo->mode_map;
306 if (likely(modemap[mode->encap] == mode)) {
307 modemap[mode->encap] = NULL;
308 module_put(mode->afinfo->owner);
309 err = 0;
310 }
311
312 xfrm_state_unlock_afinfo(afinfo);
313 return err;
314}
315EXPORT_SYMBOL(xfrm_unregister_mode);
316
317static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
318{
319 struct xfrm_state_afinfo *afinfo;
320 struct xfrm_mode *mode;
321 int modload_attempted = 0;
322
323 if (unlikely(encap >= XFRM_MODE_MAX))
324 return NULL;
325
326retry:
327 afinfo = xfrm_state_get_afinfo(family);
328 if (unlikely(afinfo == NULL))
329 return NULL;
330
331 mode = afinfo->mode_map[encap];
332 if (unlikely(mode && !try_module_get(mode->owner)))
333 mode = NULL;
334 if (!mode && !modload_attempted) {
335 xfrm_state_put_afinfo(afinfo);
336 request_module("xfrm-mode-%d-%d", family, encap);
337 modload_attempted = 1;
338 goto retry;
339 }
340
341 xfrm_state_put_afinfo(afinfo);
342 return mode;
343}
344
345static void xfrm_put_mode(struct xfrm_mode *mode)
346{
347 module_put(mode->owner);
348}
349
350static void xfrm_state_gc_destroy(struct xfrm_state *x)
351{
352 tasklet_hrtimer_cancel(&x->mtimer);
353 del_timer_sync(&x->rtimer);
354 kfree(x->aalg);
355 kfree(x->ealg);
356 kfree(x->calg);
357 kfree(x->encap);
358 kfree(x->coaddr);
359 kfree(x->replay_esn);
360 kfree(x->preplay_esn);
361 if (x->inner_mode)
362 xfrm_put_mode(x->inner_mode);
363 if (x->inner_mode_iaf)
364 xfrm_put_mode(x->inner_mode_iaf);
365 if (x->outer_mode)
366 xfrm_put_mode(x->outer_mode);
367 if (x->type) {
368 x->type->destructor(x);
369 xfrm_put_type(x->type);
370 }
371 security_xfrm_state_free(x);
372 kfree(x);
373}
374
375static void xfrm_state_gc_task(struct work_struct *work)
376{
377 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
378 struct xfrm_state *x;
379 struct hlist_node *entry, *tmp;
380 struct hlist_head gc_list;
381
382 spin_lock_bh(&xfrm_state_gc_lock);
383 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
384 spin_unlock_bh(&xfrm_state_gc_lock);
385
386 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
387 xfrm_state_gc_destroy(x);
388
389 wake_up(&net->xfrm.km_waitq);
390}
391
392static inline unsigned long make_jiffies(long secs)
393{
394 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
395 return MAX_SCHEDULE_TIMEOUT-1;
396 else
397 return secs*HZ;
398}
399
400static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
401{
402 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
403 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
404 struct net *net = xs_net(x);
405 unsigned long now = get_seconds();
406 long next = LONG_MAX;
407 int warn = 0;
408 int err = 0;
409
410 spin_lock(&x->lock);
411 if (x->km.state == XFRM_STATE_DEAD)
412 goto out;
413 if (x->km.state == XFRM_STATE_EXPIRED)
414 goto expired;
415 if (x->lft.hard_add_expires_seconds) {
416 long tmo = x->lft.hard_add_expires_seconds +
417 x->curlft.add_time - now;
418 if (tmo <= 0)
419 goto expired;
420 if (tmo < next)
421 next = tmo;
422 }
423 if (x->lft.hard_use_expires_seconds) {
424 long tmo = x->lft.hard_use_expires_seconds +
425 (x->curlft.use_time ? : now) - now;
426 if (tmo <= 0)
427 goto expired;
428 if (tmo < next)
429 next = tmo;
430 }
431 if (x->km.dying)
432 goto resched;
433 if (x->lft.soft_add_expires_seconds) {
434 long tmo = x->lft.soft_add_expires_seconds +
435 x->curlft.add_time - now;
436 if (tmo <= 0)
437 warn = 1;
438 else if (tmo < next)
439 next = tmo;
440 }
441 if (x->lft.soft_use_expires_seconds) {
442 long tmo = x->lft.soft_use_expires_seconds +
443 (x->curlft.use_time ? : now) - now;
444 if (tmo <= 0)
445 warn = 1;
446 else if (tmo < next)
447 next = tmo;
448 }
449
450 x->km.dying = warn;
451 if (warn)
452 km_state_expired(x, 0, 0);
453resched:
454 if (next != LONG_MAX){
455 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
456 }
457
458 goto out;
459
460expired:
461 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
462 x->km.state = XFRM_STATE_EXPIRED;
463 wake_up(&net->xfrm.km_waitq);
464 next = 2;
465 goto resched;
466 }
467
468 err = __xfrm_state_delete(x);
469 if (!err && x->id.spi)
470 km_state_expired(x, 1, 0);
471
472 xfrm_audit_state_delete(x, err ? 0 : 1,
473 audit_get_loginuid(current),
474 audit_get_sessionid(current), 0);
475
476out:
477 spin_unlock(&x->lock);
478 return HRTIMER_NORESTART;
479}
480
481static void xfrm_replay_timer_handler(unsigned long data);
482
483struct xfrm_state *xfrm_state_alloc(struct net *net)
484{
485 struct xfrm_state *x;
486
487 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
488
489 if (x) {
490 write_pnet(&x->xs_net, net);
491 atomic_set(&x->refcnt, 1);
492 atomic_set(&x->tunnel_users, 0);
493 INIT_LIST_HEAD(&x->km.all);
494 INIT_HLIST_NODE(&x->bydst);
495 INIT_HLIST_NODE(&x->bysrc);
496 INIT_HLIST_NODE(&x->byspi);
497 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
498 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
499 (unsigned long)x);
500 x->curlft.add_time = get_seconds();
501 x->lft.soft_byte_limit = XFRM_INF;
502 x->lft.soft_packet_limit = XFRM_INF;
503 x->lft.hard_byte_limit = XFRM_INF;
504 x->lft.hard_packet_limit = XFRM_INF;
505 x->replay_maxage = 0;
506 x->replay_maxdiff = 0;
507 x->inner_mode = NULL;
508 x->inner_mode_iaf = NULL;
509 spin_lock_init(&x->lock);
510 }
511 return x;
512}
513EXPORT_SYMBOL(xfrm_state_alloc);
514
515void __xfrm_state_destroy(struct xfrm_state *x)
516{
517 struct net *net = xs_net(x);
518
519 WARN_ON(x->km.state != XFRM_STATE_DEAD);
520
521 spin_lock_bh(&xfrm_state_gc_lock);
522 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
523 spin_unlock_bh(&xfrm_state_gc_lock);
524 schedule_work(&net->xfrm.state_gc_work);
525}
526EXPORT_SYMBOL(__xfrm_state_destroy);
527
528int __xfrm_state_delete(struct xfrm_state *x)
529{
530 struct net *net = xs_net(x);
531 int err = -ESRCH;
532
533 if (x->km.state != XFRM_STATE_DEAD) {
534 x->km.state = XFRM_STATE_DEAD;
535 spin_lock(&xfrm_state_lock);
536 list_del(&x->km.all);
537 hlist_del(&x->bydst);
538 hlist_del(&x->bysrc);
539 if (x->id.spi)
540 hlist_del(&x->byspi);
541 net->xfrm.state_num--;
542 spin_unlock(&xfrm_state_lock);
543
544 /* All xfrm_state objects are created by xfrm_state_alloc.
545 * The xfrm_state_alloc call gives a reference, and that
546 * is what we are dropping here.
547 */
548 xfrm_state_put(x);
549 err = 0;
550 }
551
552 return err;
553}
554EXPORT_SYMBOL(__xfrm_state_delete);
555
556int xfrm_state_delete(struct xfrm_state *x)
557{
558 int err;
559
560 spin_lock_bh(&x->lock);
561 err = __xfrm_state_delete(x);
562 spin_unlock_bh(&x->lock);
563
564 return err;
565}
566EXPORT_SYMBOL(xfrm_state_delete);
567
568#ifdef CONFIG_SECURITY_NETWORK_XFRM
569static inline int
570xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
571{
572 int i, err = 0;
573
574 for (i = 0; i <= net->xfrm.state_hmask; i++) {
575 struct hlist_node *entry;
576 struct xfrm_state *x;
577
578 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
579 if (xfrm_id_proto_match(x->id.proto, proto) &&
580 (err = security_xfrm_state_delete(x)) != 0) {
581 xfrm_audit_state_delete(x, 0,
582 audit_info->loginuid,
583 audit_info->sessionid,
584 audit_info->secid);
585 return err;
586 }
587 }
588 }
589
590 return err;
591}
592#else
593static inline int
594xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
595{
596 return 0;
597}
598#endif
599
600int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
601{
602 int i, err = 0, cnt = 0;
603
604 spin_lock_bh(&xfrm_state_lock);
605 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
606 if (err)
607 goto out;
608
609 err = -ESRCH;
610 for (i = 0; i <= net->xfrm.state_hmask; i++) {
611 struct hlist_node *entry;
612 struct xfrm_state *x;
613restart:
614 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
615 if (!xfrm_state_kern(x) &&
616 xfrm_id_proto_match(x->id.proto, proto)) {
617 xfrm_state_hold(x);
618 spin_unlock_bh(&xfrm_state_lock);
619
620 err = xfrm_state_delete(x);
621 xfrm_audit_state_delete(x, err ? 0 : 1,
622 audit_info->loginuid,
623 audit_info->sessionid,
624 audit_info->secid);
625 xfrm_state_put(x);
626 if (!err)
627 cnt++;
628
629 spin_lock_bh(&xfrm_state_lock);
630 goto restart;
631 }
632 }
633 }
634 if (cnt)
635 err = 0;
636
637out:
638 spin_unlock_bh(&xfrm_state_lock);
639 wake_up(&net->xfrm.km_waitq);
640 return err;
641}
642EXPORT_SYMBOL(xfrm_state_flush);
643
644void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
645{
646 spin_lock_bh(&xfrm_state_lock);
647 si->sadcnt = net->xfrm.state_num;
648 si->sadhcnt = net->xfrm.state_hmask;
649 si->sadhmcnt = xfrm_state_hashmax;
650 spin_unlock_bh(&xfrm_state_lock);
651}
652EXPORT_SYMBOL(xfrm_sad_getinfo);
653
654static int
655xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
656 const struct xfrm_tmpl *tmpl,
657 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
658 unsigned short family)
659{
660 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
661 if (!afinfo)
662 return -1;
663 afinfo->init_tempsel(&x->sel, fl);
664
665 if (family != tmpl->encap_family) {
666 xfrm_state_put_afinfo(afinfo);
667 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
668 if (!afinfo)
669 return -1;
670 }
671 afinfo->init_temprop(x, tmpl, daddr, saddr);
672 xfrm_state_put_afinfo(afinfo);
673 return 0;
674}
675
676static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
677 const xfrm_address_t *daddr,
678 __be32 spi, u8 proto,
679 unsigned short family)
680{
681 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
682 struct xfrm_state *x;
683 struct hlist_node *entry;
684
685 hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
686 if (x->props.family != family ||
687 x->id.spi != spi ||
688 x->id.proto != proto ||
689 xfrm_addr_cmp(&x->id.daddr, daddr, family))
690 continue;
691
692 if ((mark & x->mark.m) != x->mark.v)
693 continue;
694 xfrm_state_hold(x);
695 return x;
696 }
697
698 return NULL;
699}
700
701static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
702 const xfrm_address_t *daddr,
703 const xfrm_address_t *saddr,
704 u8 proto, unsigned short family)
705{
706 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
707 struct xfrm_state *x;
708 struct hlist_node *entry;
709
710 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
711 if (x->props.family != family ||
712 x->id.proto != proto ||
713 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
714 xfrm_addr_cmp(&x->props.saddr, saddr, family))
715 continue;
716
717 if ((mark & x->mark.m) != x->mark.v)
718 continue;
719 xfrm_state_hold(x);
720 return x;
721 }
722
723 return NULL;
724}
725
726static inline struct xfrm_state *
727__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
728{
729 struct net *net = xs_net(x);
730 u32 mark = x->mark.v & x->mark.m;
731
732 if (use_spi)
733 return __xfrm_state_lookup(net, mark, &x->id.daddr,
734 x->id.spi, x->id.proto, family);
735 else
736 return __xfrm_state_lookup_byaddr(net, mark,
737 &x->id.daddr,
738 &x->props.saddr,
739 x->id.proto, family);
740}
741
742static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
743{
744 if (have_hash_collision &&
745 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
746 net->xfrm.state_num > net->xfrm.state_hmask)
747 schedule_work(&net->xfrm.state_hash_work);
748}
749
750static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
751 const struct flowi *fl, unsigned short family,
752 struct xfrm_state **best, int *acq_in_progress,
753 int *error)
754{
755 /* Resolution logic:
756 * 1. There is a valid state with matching selector. Done.
757 * 2. Valid state with inappropriate selector. Skip.
758 *
759 * Entering area of "sysdeps".
760 *
761 * 3. If state is not valid, selector is temporary, it selects
762 * only session which triggered previous resolution. Key
763 * manager will do something to install a state with proper
764 * selector.
765 */
766 if (x->km.state == XFRM_STATE_VALID) {
767 if ((x->sel.family &&
768 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
769 !security_xfrm_state_pol_flow_match(x, pol, fl))
770 return;
771
772 if (!*best ||
773 (*best)->km.dying > x->km.dying ||
774 ((*best)->km.dying == x->km.dying &&
775 (*best)->curlft.add_time < x->curlft.add_time))
776 *best = x;
777 } else if (x->km.state == XFRM_STATE_ACQ) {
778 *acq_in_progress = 1;
779 } else if (x->km.state == XFRM_STATE_ERROR ||
780 x->km.state == XFRM_STATE_EXPIRED) {
781 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
782 security_xfrm_state_pol_flow_match(x, pol, fl))
783 *error = -ESRCH;
784 }
785}
786
787struct xfrm_state *
788xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
789 const struct flowi *fl, struct xfrm_tmpl *tmpl,
790 struct xfrm_policy *pol, int *err,
791 unsigned short family)
792{
793 static xfrm_address_t saddr_wildcard = { };
794 struct net *net = xp_net(pol);
795 unsigned int h, h_wildcard;
796 struct hlist_node *entry;
797 struct xfrm_state *x, *x0, *to_put;
798 int acquire_in_progress = 0;
799 int error = 0;
800 struct xfrm_state *best = NULL;
801 u32 mark = pol->mark.v & pol->mark.m;
802 unsigned short encap_family = tmpl->encap_family;
803
804 to_put = NULL;
805
806 spin_lock_bh(&xfrm_state_lock);
807 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
808 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
809 if (x->props.family == encap_family &&
810 x->props.reqid == tmpl->reqid &&
811 (mark & x->mark.m) == x->mark.v &&
812 !(x->props.flags & XFRM_STATE_WILDRECV) &&
813 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
814 tmpl->mode == x->props.mode &&
815 tmpl->id.proto == x->id.proto &&
816 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
817 xfrm_state_look_at(pol, x, fl, encap_family,
818 &best, &acquire_in_progress, &error);
819 }
820 if (best)
821 goto found;
822
823 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
824 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
825 if (x->props.family == encap_family &&
826 x->props.reqid == tmpl->reqid &&
827 (mark & x->mark.m) == x->mark.v &&
828 !(x->props.flags & XFRM_STATE_WILDRECV) &&
829 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
830 tmpl->mode == x->props.mode &&
831 tmpl->id.proto == x->id.proto &&
832 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
833 xfrm_state_look_at(pol, x, fl, encap_family,
834 &best, &acquire_in_progress, &error);
835 }
836
837found:
838 x = best;
839 if (!x && !error && !acquire_in_progress) {
840 if (tmpl->id.spi &&
841 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
842 tmpl->id.proto, encap_family)) != NULL) {
843 to_put = x0;
844 error = -EEXIST;
845 goto out;
846 }
847 x = xfrm_state_alloc(net);
848 if (x == NULL) {
849 error = -ENOMEM;
850 goto out;
851 }
852 /* Initialize temporary state matching only
853 * to current session. */
854 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
855 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
856
857 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
858 if (error) {
859 x->km.state = XFRM_STATE_DEAD;
860 to_put = x;
861 x = NULL;
862 goto out;
863 }
864
865 if (km_query(x, tmpl, pol) == 0) {
866 x->km.state = XFRM_STATE_ACQ;
867 list_add(&x->km.all, &net->xfrm.state_all);
868 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
869 h = xfrm_src_hash(net, daddr, saddr, encap_family);
870 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
871 if (x->id.spi) {
872 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
873 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
874 }
875 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
876 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
877 net->xfrm.state_num++;
878 xfrm_hash_grow_check(net, x->bydst.next != NULL);
879 } else {
880 x->km.state = XFRM_STATE_DEAD;
881 to_put = x;
882 x = NULL;
883 error = -ESRCH;
884 }
885 }
886out:
887 if (x)
888 xfrm_state_hold(x);
889 else
890 *err = acquire_in_progress ? -EAGAIN : error;
891 spin_unlock_bh(&xfrm_state_lock);
892 if (to_put)
893 xfrm_state_put(to_put);
894 return x;
895}
896
897struct xfrm_state *
898xfrm_stateonly_find(struct net *net, u32 mark,
899 xfrm_address_t *daddr, xfrm_address_t *saddr,
900 unsigned short family, u8 mode, u8 proto, u32 reqid)
901{
902 unsigned int h;
903 struct xfrm_state *rx = NULL, *x = NULL;
904 struct hlist_node *entry;
905
906 spin_lock(&xfrm_state_lock);
907 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
908 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
909 if (x->props.family == family &&
910 x->props.reqid == reqid &&
911 (mark & x->mark.m) == x->mark.v &&
912 !(x->props.flags & XFRM_STATE_WILDRECV) &&
913 xfrm_state_addr_check(x, daddr, saddr, family) &&
914 mode == x->props.mode &&
915 proto == x->id.proto &&
916 x->km.state == XFRM_STATE_VALID) {
917 rx = x;
918 break;
919 }
920 }
921
922 if (rx)
923 xfrm_state_hold(rx);
924 spin_unlock(&xfrm_state_lock);
925
926
927 return rx;
928}
929EXPORT_SYMBOL(xfrm_stateonly_find);
930
931static void __xfrm_state_insert(struct xfrm_state *x)
932{
933 struct net *net = xs_net(x);
934 unsigned int h;
935
936 list_add(&x->km.all, &net->xfrm.state_all);
937
938 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
939 x->props.reqid, x->props.family);
940 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
941
942 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
943 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
944
945 if (x->id.spi) {
946 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
947 x->props.family);
948
949 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
950 }
951
952 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
953 if (x->replay_maxage)
954 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
955
956 wake_up(&net->xfrm.km_waitq);
957
958 net->xfrm.state_num++;
959
960 xfrm_hash_grow_check(net, x->bydst.next != NULL);
961}
962
963/* xfrm_state_lock is held */
964static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
965{
966 struct net *net = xs_net(xnew);
967 unsigned short family = xnew->props.family;
968 u32 reqid = xnew->props.reqid;
969 struct xfrm_state *x;
970 struct hlist_node *entry;
971 unsigned int h;
972 u32 mark = xnew->mark.v & xnew->mark.m;
973
974 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
975 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
976 if (x->props.family == family &&
977 x->props.reqid == reqid &&
978 (mark & x->mark.m) == x->mark.v &&
979 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
980 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
981 x->genid++;
982 }
983}
984
985void xfrm_state_insert(struct xfrm_state *x)
986{
987 spin_lock_bh(&xfrm_state_lock);
988 __xfrm_state_bump_genids(x);
989 __xfrm_state_insert(x);
990 spin_unlock_bh(&xfrm_state_lock);
991}
992EXPORT_SYMBOL(xfrm_state_insert);
993
994/* xfrm_state_lock is held */
995static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
996 unsigned short family, u8 mode,
997 u32 reqid, u8 proto,
998 const xfrm_address_t *daddr,
999 const xfrm_address_t *saddr, int create)
1000{
1001 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1002 struct hlist_node *entry;
1003 struct xfrm_state *x;
1004 u32 mark = m->v & m->m;
1005
1006 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
1007 if (x->props.reqid != reqid ||
1008 x->props.mode != mode ||
1009 x->props.family != family ||
1010 x->km.state != XFRM_STATE_ACQ ||
1011 x->id.spi != 0 ||
1012 x->id.proto != proto ||
1013 (mark & x->mark.m) != x->mark.v ||
1014 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
1015 xfrm_addr_cmp(&x->props.saddr, saddr, family))
1016 continue;
1017
1018 xfrm_state_hold(x);
1019 return x;
1020 }
1021
1022 if (!create)
1023 return NULL;
1024
1025 x = xfrm_state_alloc(net);
1026 if (likely(x)) {
1027 switch (family) {
1028 case AF_INET:
1029 x->sel.daddr.a4 = daddr->a4;
1030 x->sel.saddr.a4 = saddr->a4;
1031 x->sel.prefixlen_d = 32;
1032 x->sel.prefixlen_s = 32;
1033 x->props.saddr.a4 = saddr->a4;
1034 x->id.daddr.a4 = daddr->a4;
1035 break;
1036
1037 case AF_INET6:
1038 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1039 (struct in6_addr *)daddr);
1040 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1041 (struct in6_addr *)saddr);
1042 x->sel.prefixlen_d = 128;
1043 x->sel.prefixlen_s = 128;
1044 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1045 (struct in6_addr *)saddr);
1046 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1047 (struct in6_addr *)daddr);
1048 break;
1049 }
1050
1051 x->km.state = XFRM_STATE_ACQ;
1052 x->id.proto = proto;
1053 x->props.family = family;
1054 x->props.mode = mode;
1055 x->props.reqid = reqid;
1056 x->mark.v = m->v;
1057 x->mark.m = m->m;
1058 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1059 xfrm_state_hold(x);
1060 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1061 list_add(&x->km.all, &net->xfrm.state_all);
1062 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1063 h = xfrm_src_hash(net, daddr, saddr, family);
1064 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1065
1066 net->xfrm.state_num++;
1067
1068 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1069 }
1070
1071 return x;
1072}
1073
1074static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1075
1076int xfrm_state_add(struct xfrm_state *x)
1077{
1078 struct net *net = xs_net(x);
1079 struct xfrm_state *x1, *to_put;
1080 int family;
1081 int err;
1082 u32 mark = x->mark.v & x->mark.m;
1083 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1084
1085 family = x->props.family;
1086
1087 to_put = NULL;
1088
1089 spin_lock_bh(&xfrm_state_lock);
1090
1091 x1 = __xfrm_state_locate(x, use_spi, family);
1092 if (x1) {
1093 to_put = x1;
1094 x1 = NULL;
1095 err = -EEXIST;
1096 goto out;
1097 }
1098
1099 if (use_spi && x->km.seq) {
1100 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1101 if (x1 && ((x1->id.proto != x->id.proto) ||
1102 xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1103 to_put = x1;
1104 x1 = NULL;
1105 }
1106 }
1107
1108 if (use_spi && !x1)
1109 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1110 x->props.reqid, x->id.proto,
1111 &x->id.daddr, &x->props.saddr, 0);
1112
1113 __xfrm_state_bump_genids(x);
1114 __xfrm_state_insert(x);
1115 err = 0;
1116
1117out:
1118 spin_unlock_bh(&xfrm_state_lock);
1119
1120 if (x1) {
1121 xfrm_state_delete(x1);
1122 xfrm_state_put(x1);
1123 }
1124
1125 if (to_put)
1126 xfrm_state_put(to_put);
1127
1128 return err;
1129}
1130EXPORT_SYMBOL(xfrm_state_add);
1131
1132#ifdef CONFIG_XFRM_MIGRATE
1133static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1134{
1135 struct net *net = xs_net(orig);
1136 int err = -ENOMEM;
1137 struct xfrm_state *x = xfrm_state_alloc(net);
1138 if (!x)
1139 goto out;
1140
1141 memcpy(&x->id, &orig->id, sizeof(x->id));
1142 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1143 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1144 x->props.mode = orig->props.mode;
1145 x->props.replay_window = orig->props.replay_window;
1146 x->props.reqid = orig->props.reqid;
1147 x->props.family = orig->props.family;
1148 x->props.saddr = orig->props.saddr;
1149
1150 if (orig->aalg) {
1151 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1152 if (!x->aalg)
1153 goto error;
1154 }
1155 x->props.aalgo = orig->props.aalgo;
1156
1157 if (orig->ealg) {
1158 x->ealg = xfrm_algo_clone(orig->ealg);
1159 if (!x->ealg)
1160 goto error;
1161 }
1162 x->props.ealgo = orig->props.ealgo;
1163
1164 if (orig->calg) {
1165 x->calg = xfrm_algo_clone(orig->calg);
1166 if (!x->calg)
1167 goto error;
1168 }
1169 x->props.calgo = orig->props.calgo;
1170
1171 if (orig->encap) {
1172 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1173 if (!x->encap)
1174 goto error;
1175 }
1176
1177 if (orig->coaddr) {
1178 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1179 GFP_KERNEL);
1180 if (!x->coaddr)
1181 goto error;
1182 }
1183
1184 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1185
1186 err = xfrm_init_state(x);
1187 if (err)
1188 goto error;
1189
1190 x->props.flags = orig->props.flags;
1191
1192 x->curlft.add_time = orig->curlft.add_time;
1193 x->km.state = orig->km.state;
1194 x->km.seq = orig->km.seq;
1195
1196 return x;
1197
1198 error:
1199 xfrm_state_put(x);
1200out:
1201 if (errp)
1202 *errp = err;
1203 return NULL;
1204}
1205
1206/* xfrm_state_lock is held */
1207struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1208{
1209 unsigned int h;
1210 struct xfrm_state *x;
1211 struct hlist_node *entry;
1212
1213 if (m->reqid) {
1214 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1215 m->reqid, m->old_family);
1216 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1217 if (x->props.mode != m->mode ||
1218 x->id.proto != m->proto)
1219 continue;
1220 if (m->reqid && x->props.reqid != m->reqid)
1221 continue;
1222 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1223 m->old_family) ||
1224 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1225 m->old_family))
1226 continue;
1227 xfrm_state_hold(x);
1228 return x;
1229 }
1230 } else {
1231 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1232 m->old_family);
1233 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1234 if (x->props.mode != m->mode ||
1235 x->id.proto != m->proto)
1236 continue;
1237 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1238 m->old_family) ||
1239 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1240 m->old_family))
1241 continue;
1242 xfrm_state_hold(x);
1243 return x;
1244 }
1245 }
1246
1247 return NULL;
1248}
1249EXPORT_SYMBOL(xfrm_migrate_state_find);
1250
1251struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1252 struct xfrm_migrate *m)
1253{
1254 struct xfrm_state *xc;
1255 int err;
1256
1257 xc = xfrm_state_clone(x, &err);
1258 if (!xc)
1259 return NULL;
1260
1261 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1262 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1263
1264 /* add state */
1265 if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1266 /* a care is needed when the destination address of the
1267 state is to be updated as it is a part of triplet */
1268 xfrm_state_insert(xc);
1269 } else {
1270 if ((err = xfrm_state_add(xc)) < 0)
1271 goto error;
1272 }
1273
1274 return xc;
1275error:
1276 xfrm_state_put(xc);
1277 return NULL;
1278}
1279EXPORT_SYMBOL(xfrm_state_migrate);
1280#endif
1281
1282int xfrm_state_update(struct xfrm_state *x)
1283{
1284 struct xfrm_state *x1, *to_put;
1285 int err;
1286 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1287
1288 to_put = NULL;
1289
1290 spin_lock_bh(&xfrm_state_lock);
1291 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1292
1293 err = -ESRCH;
1294 if (!x1)
1295 goto out;
1296
1297 if (xfrm_state_kern(x1)) {
1298 to_put = x1;
1299 err = -EEXIST;
1300 goto out;
1301 }
1302
1303 if (x1->km.state == XFRM_STATE_ACQ) {
1304 __xfrm_state_insert(x);
1305 x = NULL;
1306 }
1307 err = 0;
1308
1309out:
1310 spin_unlock_bh(&xfrm_state_lock);
1311
1312 if (to_put)
1313 xfrm_state_put(to_put);
1314
1315 if (err)
1316 return err;
1317
1318 if (!x) {
1319 xfrm_state_delete(x1);
1320 xfrm_state_put(x1);
1321 return 0;
1322 }
1323
1324 err = -EINVAL;
1325 spin_lock_bh(&x1->lock);
1326 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1327 if (x->encap && x1->encap)
1328 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1329 if (x->coaddr && x1->coaddr) {
1330 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1331 }
1332 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1333 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1334 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1335 x1->km.dying = 0;
1336
1337 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1338 if (x1->curlft.use_time)
1339 xfrm_state_check_expire(x1);
1340
1341 err = 0;
1342 }
1343 spin_unlock_bh(&x1->lock);
1344
1345 xfrm_state_put(x1);
1346
1347 return err;
1348}
1349EXPORT_SYMBOL(xfrm_state_update);
1350
1351int xfrm_state_check_expire(struct xfrm_state *x)
1352{
1353 if (!x->curlft.use_time)
1354 x->curlft.use_time = get_seconds();
1355
1356 if (x->km.state != XFRM_STATE_VALID)
1357 return -EINVAL;
1358
1359 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1360 x->curlft.packets >= x->lft.hard_packet_limit) {
1361 x->km.state = XFRM_STATE_EXPIRED;
1362 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1363 return -EINVAL;
1364 }
1365
1366 if (!x->km.dying &&
1367 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1368 x->curlft.packets >= x->lft.soft_packet_limit)) {
1369 x->km.dying = 1;
1370 km_state_expired(x, 0, 0);
1371 }
1372 return 0;
1373}
1374EXPORT_SYMBOL(xfrm_state_check_expire);
1375
1376struct xfrm_state *
1377xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1378 u8 proto, unsigned short family)
1379{
1380 struct xfrm_state *x;
1381
1382 spin_lock_bh(&xfrm_state_lock);
1383 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1384 spin_unlock_bh(&xfrm_state_lock);
1385 return x;
1386}
1387EXPORT_SYMBOL(xfrm_state_lookup);
1388
1389struct xfrm_state *
1390xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1391 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1392 u8 proto, unsigned short family)
1393{
1394 struct xfrm_state *x;
1395
1396 spin_lock_bh(&xfrm_state_lock);
1397 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1398 spin_unlock_bh(&xfrm_state_lock);
1399 return x;
1400}
1401EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1402
1403struct xfrm_state *
1404xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1405 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1406 int create, unsigned short family)
1407{
1408 struct xfrm_state *x;
1409
1410 spin_lock_bh(&xfrm_state_lock);
1411 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1412 spin_unlock_bh(&xfrm_state_lock);
1413
1414 return x;
1415}
1416EXPORT_SYMBOL(xfrm_find_acq);
1417
1418#ifdef CONFIG_XFRM_SUB_POLICY
1419int
1420xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1421 unsigned short family)
1422{
1423 int err = 0;
1424 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1425 if (!afinfo)
1426 return -EAFNOSUPPORT;
1427
1428 spin_lock_bh(&xfrm_state_lock);
1429 if (afinfo->tmpl_sort)
1430 err = afinfo->tmpl_sort(dst, src, n);
1431 spin_unlock_bh(&xfrm_state_lock);
1432 xfrm_state_put_afinfo(afinfo);
1433 return err;
1434}
1435EXPORT_SYMBOL(xfrm_tmpl_sort);
1436
1437int
1438xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1439 unsigned short family)
1440{
1441 int err = 0;
1442 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1443 if (!afinfo)
1444 return -EAFNOSUPPORT;
1445
1446 spin_lock_bh(&xfrm_state_lock);
1447 if (afinfo->state_sort)
1448 err = afinfo->state_sort(dst, src, n);
1449 spin_unlock_bh(&xfrm_state_lock);
1450 xfrm_state_put_afinfo(afinfo);
1451 return err;
1452}
1453EXPORT_SYMBOL(xfrm_state_sort);
1454#endif
1455
1456/* Silly enough, but I'm lazy to build resolution list */
1457
1458static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1459{
1460 int i;
1461
1462 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1463 struct hlist_node *entry;
1464 struct xfrm_state *x;
1465
1466 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1467 if (x->km.seq == seq &&
1468 (mark & x->mark.m) == x->mark.v &&
1469 x->km.state == XFRM_STATE_ACQ) {
1470 xfrm_state_hold(x);
1471 return x;
1472 }
1473 }
1474 }
1475 return NULL;
1476}
1477
1478struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1479{
1480 struct xfrm_state *x;
1481
1482 spin_lock_bh(&xfrm_state_lock);
1483 x = __xfrm_find_acq_byseq(net, mark, seq);
1484 spin_unlock_bh(&xfrm_state_lock);
1485 return x;
1486}
1487EXPORT_SYMBOL(xfrm_find_acq_byseq);
1488
1489u32 xfrm_get_acqseq(void)
1490{
1491 u32 res;
1492 static atomic_t acqseq;
1493
1494 do {
1495 res = atomic_inc_return(&acqseq);
1496 } while (!res);
1497
1498 return res;
1499}
1500EXPORT_SYMBOL(xfrm_get_acqseq);
1501
1502int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1503{
1504 struct net *net = xs_net(x);
1505 unsigned int h;
1506 struct xfrm_state *x0;
1507 int err = -ENOENT;
1508 __be32 minspi = htonl(low);
1509 __be32 maxspi = htonl(high);
1510 u32 mark = x->mark.v & x->mark.m;
1511
1512 spin_lock_bh(&x->lock);
1513 if (x->km.state == XFRM_STATE_DEAD)
1514 goto unlock;
1515
1516 err = 0;
1517 if (x->id.spi)
1518 goto unlock;
1519
1520 err = -ENOENT;
1521
1522 if (minspi == maxspi) {
1523 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1524 if (x0) {
1525 xfrm_state_put(x0);
1526 goto unlock;
1527 }
1528 x->id.spi = minspi;
1529 } else {
1530 u32 spi = 0;
1531 for (h=0; h<high-low+1; h++) {
1532 spi = low + net_random()%(high-low+1);
1533 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1534 if (x0 == NULL) {
1535 x->id.spi = htonl(spi);
1536 break;
1537 }
1538 xfrm_state_put(x0);
1539 }
1540 }
1541 if (x->id.spi) {
1542 spin_lock_bh(&xfrm_state_lock);
1543 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1544 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1545 spin_unlock_bh(&xfrm_state_lock);
1546
1547 err = 0;
1548 }
1549
1550unlock:
1551 spin_unlock_bh(&x->lock);
1552
1553 return err;
1554}
1555EXPORT_SYMBOL(xfrm_alloc_spi);
1556
1557int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1558 int (*func)(struct xfrm_state *, int, void*),
1559 void *data)
1560{
1561 struct xfrm_state *state;
1562 struct xfrm_state_walk *x;
1563 int err = 0;
1564
1565 if (walk->seq != 0 && list_empty(&walk->all))
1566 return 0;
1567
1568 spin_lock_bh(&xfrm_state_lock);
1569 if (list_empty(&walk->all))
1570 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1571 else
1572 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1573 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1574 if (x->state == XFRM_STATE_DEAD)
1575 continue;
1576 state = container_of(x, struct xfrm_state, km);
1577 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1578 continue;
1579 err = func(state, walk->seq, data);
1580 if (err) {
1581 list_move_tail(&walk->all, &x->all);
1582 goto out;
1583 }
1584 walk->seq++;
1585 }
1586 if (walk->seq == 0) {
1587 err = -ENOENT;
1588 goto out;
1589 }
1590 list_del_init(&walk->all);
1591out:
1592 spin_unlock_bh(&xfrm_state_lock);
1593 return err;
1594}
1595EXPORT_SYMBOL(xfrm_state_walk);
1596
1597void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1598{
1599 INIT_LIST_HEAD(&walk->all);
1600 walk->proto = proto;
1601 walk->state = XFRM_STATE_DEAD;
1602 walk->seq = 0;
1603}
1604EXPORT_SYMBOL(xfrm_state_walk_init);
1605
1606void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1607{
1608 if (list_empty(&walk->all))
1609 return;
1610
1611 spin_lock_bh(&xfrm_state_lock);
1612 list_del(&walk->all);
1613 spin_unlock_bh(&xfrm_state_lock);
1614}
1615EXPORT_SYMBOL(xfrm_state_walk_done);
1616
1617static void xfrm_replay_timer_handler(unsigned long data)
1618{
1619 struct xfrm_state *x = (struct xfrm_state*)data;
1620
1621 spin_lock(&x->lock);
1622
1623 if (x->km.state == XFRM_STATE_VALID) {
1624 if (xfrm_aevent_is_on(xs_net(x)))
1625 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1626 else
1627 x->xflags |= XFRM_TIME_DEFER;
1628 }
1629
1630 spin_unlock(&x->lock);
1631}
1632
1633static LIST_HEAD(xfrm_km_list);
1634static DEFINE_RWLOCK(xfrm_km_lock);
1635
1636void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1637{
1638 struct xfrm_mgr *km;
1639
1640 read_lock(&xfrm_km_lock);
1641 list_for_each_entry(km, &xfrm_km_list, list)
1642 if (km->notify_policy)
1643 km->notify_policy(xp, dir, c);
1644 read_unlock(&xfrm_km_lock);
1645}
1646
1647void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1648{
1649 struct xfrm_mgr *km;
1650 read_lock(&xfrm_km_lock);
1651 list_for_each_entry(km, &xfrm_km_list, list)
1652 if (km->notify)
1653 km->notify(x, c);
1654 read_unlock(&xfrm_km_lock);
1655}
1656
1657EXPORT_SYMBOL(km_policy_notify);
1658EXPORT_SYMBOL(km_state_notify);
1659
1660void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1661{
1662 struct net *net = xs_net(x);
1663 struct km_event c;
1664
1665 c.data.hard = hard;
1666 c.pid = pid;
1667 c.event = XFRM_MSG_EXPIRE;
1668 km_state_notify(x, &c);
1669
1670 if (hard)
1671 wake_up(&net->xfrm.km_waitq);
1672}
1673
1674EXPORT_SYMBOL(km_state_expired);
1675/*
1676 * We send to all registered managers regardless of failure
1677 * We are happy with one success
1678*/
1679int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1680{
1681 int err = -EINVAL, acqret;
1682 struct xfrm_mgr *km;
1683
1684 read_lock(&xfrm_km_lock);
1685 list_for_each_entry(km, &xfrm_km_list, list) {
1686 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1687 if (!acqret)
1688 err = acqret;
1689 }
1690 read_unlock(&xfrm_km_lock);
1691 return err;
1692}
1693EXPORT_SYMBOL(km_query);
1694
1695int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1696{
1697 int err = -EINVAL;
1698 struct xfrm_mgr *km;
1699
1700 read_lock(&xfrm_km_lock);
1701 list_for_each_entry(km, &xfrm_km_list, list) {
1702 if (km->new_mapping)
1703 err = km->new_mapping(x, ipaddr, sport);
1704 if (!err)
1705 break;
1706 }
1707 read_unlock(&xfrm_km_lock);
1708 return err;
1709}
1710EXPORT_SYMBOL(km_new_mapping);
1711
1712void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1713{
1714 struct net *net = xp_net(pol);
1715 struct km_event c;
1716
1717 c.data.hard = hard;
1718 c.pid = pid;
1719 c.event = XFRM_MSG_POLEXPIRE;
1720 km_policy_notify(pol, dir, &c);
1721
1722 if (hard)
1723 wake_up(&net->xfrm.km_waitq);
1724}
1725EXPORT_SYMBOL(km_policy_expired);
1726
1727#ifdef CONFIG_XFRM_MIGRATE
1728int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1729 const struct xfrm_migrate *m, int num_migrate,
1730 const struct xfrm_kmaddress *k)
1731{
1732 int err = -EINVAL;
1733 int ret;
1734 struct xfrm_mgr *km;
1735
1736 read_lock(&xfrm_km_lock);
1737 list_for_each_entry(km, &xfrm_km_list, list) {
1738 if (km->migrate) {
1739 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1740 if (!ret)
1741 err = ret;
1742 }
1743 }
1744 read_unlock(&xfrm_km_lock);
1745 return err;
1746}
1747EXPORT_SYMBOL(km_migrate);
1748#endif
1749
1750int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1751{
1752 int err = -EINVAL;
1753 int ret;
1754 struct xfrm_mgr *km;
1755
1756 read_lock(&xfrm_km_lock);
1757 list_for_each_entry(km, &xfrm_km_list, list) {
1758 if (km->report) {
1759 ret = km->report(net, proto, sel, addr);
1760 if (!ret)
1761 err = ret;
1762 }
1763 }
1764 read_unlock(&xfrm_km_lock);
1765 return err;
1766}
1767EXPORT_SYMBOL(km_report);
1768
1769int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1770{
1771 int err;
1772 u8 *data;
1773 struct xfrm_mgr *km;
1774 struct xfrm_policy *pol = NULL;
1775
1776 if (optlen <= 0 || optlen > PAGE_SIZE)
1777 return -EMSGSIZE;
1778
1779 data = kmalloc(optlen, GFP_KERNEL);
1780 if (!data)
1781 return -ENOMEM;
1782
1783 err = -EFAULT;
1784 if (copy_from_user(data, optval, optlen))
1785 goto out;
1786
1787 err = -EINVAL;
1788 read_lock(&xfrm_km_lock);
1789 list_for_each_entry(km, &xfrm_km_list, list) {
1790 pol = km->compile_policy(sk, optname, data,
1791 optlen, &err);
1792 if (err >= 0)
1793 break;
1794 }
1795 read_unlock(&xfrm_km_lock);
1796
1797 if (err >= 0) {
1798 xfrm_sk_policy_insert(sk, err, pol);
1799 xfrm_pol_put(pol);
1800 err = 0;
1801 }
1802
1803out:
1804 kfree(data);
1805 return err;
1806}
1807EXPORT_SYMBOL(xfrm_user_policy);
1808
1809int xfrm_register_km(struct xfrm_mgr *km)
1810{
1811 write_lock_bh(&xfrm_km_lock);
1812 list_add_tail(&km->list, &xfrm_km_list);
1813 write_unlock_bh(&xfrm_km_lock);
1814 return 0;
1815}
1816EXPORT_SYMBOL(xfrm_register_km);
1817
1818int xfrm_unregister_km(struct xfrm_mgr *km)
1819{
1820 write_lock_bh(&xfrm_km_lock);
1821 list_del(&km->list);
1822 write_unlock_bh(&xfrm_km_lock);
1823 return 0;
1824}
1825EXPORT_SYMBOL(xfrm_unregister_km);
1826
1827int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1828{
1829 int err = 0;
1830 if (unlikely(afinfo == NULL))
1831 return -EINVAL;
1832 if (unlikely(afinfo->family >= NPROTO))
1833 return -EAFNOSUPPORT;
1834 write_lock_bh(&xfrm_state_afinfo_lock);
1835 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1836 err = -ENOBUFS;
1837 else
1838 xfrm_state_afinfo[afinfo->family] = afinfo;
1839 write_unlock_bh(&xfrm_state_afinfo_lock);
1840 return err;
1841}
1842EXPORT_SYMBOL(xfrm_state_register_afinfo);
1843
1844int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1845{
1846 int err = 0;
1847 if (unlikely(afinfo == NULL))
1848 return -EINVAL;
1849 if (unlikely(afinfo->family >= NPROTO))
1850 return -EAFNOSUPPORT;
1851 write_lock_bh(&xfrm_state_afinfo_lock);
1852 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1853 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1854 err = -EINVAL;
1855 else
1856 xfrm_state_afinfo[afinfo->family] = NULL;
1857 }
1858 write_unlock_bh(&xfrm_state_afinfo_lock);
1859 return err;
1860}
1861EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1862
1863static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1864{
1865 struct xfrm_state_afinfo *afinfo;
1866 if (unlikely(family >= NPROTO))
1867 return NULL;
1868 read_lock(&xfrm_state_afinfo_lock);
1869 afinfo = xfrm_state_afinfo[family];
1870 if (unlikely(!afinfo))
1871 read_unlock(&xfrm_state_afinfo_lock);
1872 return afinfo;
1873}
1874
1875static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1876 __releases(xfrm_state_afinfo_lock)
1877{
1878 read_unlock(&xfrm_state_afinfo_lock);
1879}
1880
1881/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1882void xfrm_state_delete_tunnel(struct xfrm_state *x)
1883{
1884 if (x->tunnel) {
1885 struct xfrm_state *t = x->tunnel;
1886
1887 if (atomic_read(&t->tunnel_users) == 2)
1888 xfrm_state_delete(t);
1889 atomic_dec(&t->tunnel_users);
1890 xfrm_state_put(t);
1891 x->tunnel = NULL;
1892 }
1893}
1894EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1895
1896int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1897{
1898 int res;
1899
1900 spin_lock_bh(&x->lock);
1901 if (x->km.state == XFRM_STATE_VALID &&
1902 x->type && x->type->get_mtu)
1903 res = x->type->get_mtu(x, mtu);
1904 else
1905 res = mtu - x->props.header_len;
1906 spin_unlock_bh(&x->lock);
1907 return res;
1908}
1909
1910int xfrm_init_state(struct xfrm_state *x)
1911{
1912 struct xfrm_state_afinfo *afinfo;
1913 struct xfrm_mode *inner_mode;
1914 int family = x->props.family;
1915 int err;
1916
1917 err = -EAFNOSUPPORT;
1918 afinfo = xfrm_state_get_afinfo(family);
1919 if (!afinfo)
1920 goto error;
1921
1922 err = 0;
1923 if (afinfo->init_flags)
1924 err = afinfo->init_flags(x);
1925
1926 xfrm_state_put_afinfo(afinfo);
1927
1928 if (err)
1929 goto error;
1930
1931 err = -EPROTONOSUPPORT;
1932
1933 if (x->sel.family != AF_UNSPEC) {
1934 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1935 if (inner_mode == NULL)
1936 goto error;
1937
1938 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1939 family != x->sel.family) {
1940 xfrm_put_mode(inner_mode);
1941 goto error;
1942 }
1943
1944 x->inner_mode = inner_mode;
1945 } else {
1946 struct xfrm_mode *inner_mode_iaf;
1947 int iafamily = AF_INET;
1948
1949 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1950 if (inner_mode == NULL)
1951 goto error;
1952
1953 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1954 xfrm_put_mode(inner_mode);
1955 goto error;
1956 }
1957 x->inner_mode = inner_mode;
1958
1959 if (x->props.family == AF_INET)
1960 iafamily = AF_INET6;
1961
1962 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1963 if (inner_mode_iaf) {
1964 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1965 x->inner_mode_iaf = inner_mode_iaf;
1966 else
1967 xfrm_put_mode(inner_mode_iaf);
1968 }
1969 }
1970
1971 x->type = xfrm_get_type(x->id.proto, family);
1972 if (x->type == NULL)
1973 goto error;
1974
1975 err = x->type->init_state(x);
1976 if (err)
1977 goto error;
1978
1979 x->outer_mode = xfrm_get_mode(x->props.mode, family);
1980 if (x->outer_mode == NULL)
1981 goto error;
1982
1983 x->km.state = XFRM_STATE_VALID;
1984
1985error:
1986 return err;
1987}
1988
1989EXPORT_SYMBOL(xfrm_init_state);
1990
1991int __net_init xfrm_state_init(struct net *net)
1992{
1993 unsigned int sz;
1994
1995 INIT_LIST_HEAD(&net->xfrm.state_all);
1996
1997 sz = sizeof(struct hlist_head) * 8;
1998
1999 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2000 if (!net->xfrm.state_bydst)
2001 goto out_bydst;
2002 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2003 if (!net->xfrm.state_bysrc)
2004 goto out_bysrc;
2005 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2006 if (!net->xfrm.state_byspi)
2007 goto out_byspi;
2008 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2009
2010 net->xfrm.state_num = 0;
2011 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2012 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2013 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2014 init_waitqueue_head(&net->xfrm.km_waitq);
2015 return 0;
2016
2017out_byspi:
2018 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2019out_bysrc:
2020 xfrm_hash_free(net->xfrm.state_bydst, sz);
2021out_bydst:
2022 return -ENOMEM;
2023}
2024
2025void xfrm_state_fini(struct net *net)
2026{
2027 struct xfrm_audit audit_info;
2028 unsigned int sz;
2029
2030 flush_work(&net->xfrm.state_hash_work);
2031 audit_info.loginuid = -1;
2032 audit_info.sessionid = -1;
2033 audit_info.secid = 0;
2034 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2035 flush_work(&net->xfrm.state_gc_work);
2036
2037 WARN_ON(!list_empty(&net->xfrm.state_all));
2038
2039 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2040 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2041 xfrm_hash_free(net->xfrm.state_byspi, sz);
2042 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2043 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2044 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2045 xfrm_hash_free(net->xfrm.state_bydst, sz);
2046}
2047
2048#ifdef CONFIG_AUDITSYSCALL
2049static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2050 struct audit_buffer *audit_buf)
2051{
2052 struct xfrm_sec_ctx *ctx = x->security;
2053 u32 spi = ntohl(x->id.spi);
2054
2055 if (ctx)
2056 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2057 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2058
2059 switch(x->props.family) {
2060 case AF_INET:
2061 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2062 &x->props.saddr.a4, &x->id.daddr.a4);
2063 break;
2064 case AF_INET6:
2065 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2066 x->props.saddr.a6, x->id.daddr.a6);
2067 break;
2068 }
2069
2070 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2071}
2072
2073static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2074 struct audit_buffer *audit_buf)
2075{
2076 struct iphdr *iph4;
2077 struct ipv6hdr *iph6;
2078
2079 switch (family) {
2080 case AF_INET:
2081 iph4 = ip_hdr(skb);
2082 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2083 &iph4->saddr, &iph4->daddr);
2084 break;
2085 case AF_INET6:
2086 iph6 = ipv6_hdr(skb);
2087 audit_log_format(audit_buf,
2088 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2089 &iph6->saddr,&iph6->daddr,
2090 iph6->flow_lbl[0] & 0x0f,
2091 iph6->flow_lbl[1],
2092 iph6->flow_lbl[2]);
2093 break;
2094 }
2095}
2096
2097void xfrm_audit_state_add(struct xfrm_state *x, int result,
2098 uid_t auid, u32 sessionid, u32 secid)
2099{
2100 struct audit_buffer *audit_buf;
2101
2102 audit_buf = xfrm_audit_start("SAD-add");
2103 if (audit_buf == NULL)
2104 return;
2105 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2106 xfrm_audit_helper_sainfo(x, audit_buf);
2107 audit_log_format(audit_buf, " res=%u", result);
2108 audit_log_end(audit_buf);
2109}
2110EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2111
2112void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2113 uid_t auid, u32 sessionid, u32 secid)
2114{
2115 struct audit_buffer *audit_buf;
2116
2117 audit_buf = xfrm_audit_start("SAD-delete");
2118 if (audit_buf == NULL)
2119 return;
2120 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2121 xfrm_audit_helper_sainfo(x, audit_buf);
2122 audit_log_format(audit_buf, " res=%u", result);
2123 audit_log_end(audit_buf);
2124}
2125EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2126
2127void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2128 struct sk_buff *skb)
2129{
2130 struct audit_buffer *audit_buf;
2131 u32 spi;
2132
2133 audit_buf = xfrm_audit_start("SA-replay-overflow");
2134 if (audit_buf == NULL)
2135 return;
2136 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2137 /* don't record the sequence number because it's inherent in this kind
2138 * of audit message */
2139 spi = ntohl(x->id.spi);
2140 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2141 audit_log_end(audit_buf);
2142}
2143EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2144
2145void xfrm_audit_state_replay(struct xfrm_state *x,
2146 struct sk_buff *skb, __be32 net_seq)
2147{
2148 struct audit_buffer *audit_buf;
2149 u32 spi;
2150
2151 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2152 if (audit_buf == NULL)
2153 return;
2154 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2155 spi = ntohl(x->id.spi);
2156 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2157 spi, spi, ntohl(net_seq));
2158 audit_log_end(audit_buf);
2159}
2160EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2161
2162void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2163{
2164 struct audit_buffer *audit_buf;
2165
2166 audit_buf = xfrm_audit_start("SA-notfound");
2167 if (audit_buf == NULL)
2168 return;
2169 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2170 audit_log_end(audit_buf);
2171}
2172EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2173
2174void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2175 __be32 net_spi, __be32 net_seq)
2176{
2177 struct audit_buffer *audit_buf;
2178 u32 spi;
2179
2180 audit_buf = xfrm_audit_start("SA-notfound");
2181 if (audit_buf == NULL)
2182 return;
2183 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2184 spi = ntohl(net_spi);
2185 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2186 spi, spi, ntohl(net_seq));
2187 audit_log_end(audit_buf);
2188}
2189EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2190
2191void xfrm_audit_state_icvfail(struct xfrm_state *x,
2192 struct sk_buff *skb, u8 proto)
2193{
2194 struct audit_buffer *audit_buf;
2195 __be32 net_spi;
2196 __be32 net_seq;
2197
2198 audit_buf = xfrm_audit_start("SA-icv-failure");
2199 if (audit_buf == NULL)
2200 return;
2201 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2202 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2203 u32 spi = ntohl(net_spi);
2204 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2205 spi, spi, ntohl(net_seq));
2206 }
2207 audit_log_end(audit_buf);
2208}
2209EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2210#endif /* CONFIG_AUDITSYSCALL */
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